Security key
H8817H100
Transocean Ltd. - Shares, $0.10 par value (RIG)
CUSIP: H8817H100
Q1 2026 13F Holders as of 31 Mar 2026
- Security type / class
- Equity / Shares, $0.10 par value
- Total 13F shares
- 907,331,915
- Total 13F value
- $6,013,062,343
- Share change
- +134,571,009
- Put/Call ratio
- 115%
- SEC-reported price per share
- $6.63
- Number of holders
- 539
- Value change
- +$987,115,445
- Number of buys
- 298
- Number of sells
- 197
- Shares outstanding
- 1,101,344,330
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2026
Institutions
539
Top holders
10
RIG full security history
Ownership snapshot
Full 13F holder table
Transocean Ltd. SEC filings
Transocean Ltd. company facts
Transocean Ltd. 13D/G history
Broader feeds
Ownership snapshot
Top reported holders of RIG - Transocean Ltd. - Shares, $0.10 par value (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Frederik W. Mohn
Disclosed value leader
VANGUARD GROUP INC
Comparable rows
4/15
Latest evidence
09 Feb 2026
13D/G
13F
3/4/5
Lead comparable stake: 8.8%
11 rows are not safely comparable across share classes.
13D/G row: Frederik W. Mohn
Showing 1-6 of 15 holder rows.
Quick read
Frederik W. Mohn leads the comparable SEC ownership view at 8.8%.
4 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Frederik W. Mohn's linked filing trail.
Comparable ownership
Top 4
Frederik W. Mohn
8.8%
BlackRock, Inc.
6.4%
Capital World Investors
4.6%
PRIMECAP MANAGEMENT CO/CA/
1.5%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Frederik W. Mohn |
13D/G
|
8.8%
Reported 13D/G
· 09 Feb 2026
|
$400,272,583
96,918,301 shares
|
+$6,195,000 | 09 Feb 2026 |
| BlackRock, Inc. |
13F
13D/G
Company
|
6.4%
Reported 13D/G
· 31 Mar 2025
|
$364,030,423
88,142,959 shares
|
— | 31 Dec 2025 |
| Capital World Investors |
13D/G
13F
Company
|
4.6%
Reported 13D/G
· 31 Dec 2024
|
$88,489,751
40,222,614 shares
|
-$17,683,721 | 31 Dec 2024 |
| PRIMECAP MANAGEMENT CO/CA/ |
13D/G
13F
Company
|
1.5%
Reported 13D/G
· 30 Jun 2025
|
$37,542,425
13,126,722 shares
|
$0 | 30 Jun 2025 |
| VANGUARD GROUP INC |
13F
Company
|
—
denominator unverified
|
$400,635,866
97,006,263 shares
|
— | 31 Dec 2025 |
| Perestroika |
3/4/5
Director
|
—
denominator unverified
|
$388,231,073
96,574,894 shares
|
+$6,030,000 | 24 Nov 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
539
Shares
907,331,915
Rows available
539
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2026 vs Q1 2026 Across Filers
Q1 2026 holders
539
Q1 2026 holders
539
Holder diff
0
| Investor | Q1 2026 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q1 2026 value | Value change | Value Chg % |
|---|